PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 1579–1589

1st Virtual European Conference on Fracture Experimental investigation of physical and mechanical properties of processes accompanied with phase transition in water-saturated soil 1st Virtual European Conference on Fracture Experimental investigation of physical and mechanical properties of processes accompanied with phase transition in water-saturated soil

Prokhorov A.*, Zhelnin M., Kostina A., Plekhov O. a Institute of continous media mechanics UB RAS, 1 Ak. Koroleve str. Perm 614013, Russia Prokhorov A.*, Zhelnin M., Kostina A., Plekhov O. a Institute of continous media mechanics UB RAS, 1 Ak. Koroleve str. Perm 614013, Russia

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo The paper considers the possibility of using a fiber-optic system for recording a temperature decrease during a soil freezing process and deformations arising in water-saturated soil due to frost heave. The features of the freezing front propagation and moisture redistribution are discussed. Two types of experiment were carried out all-round freezing and one-side freezing. It is important that the experiments simulate different direction of freezing front propagation. To analyze the experimental data a thermo-hydro-mechanical model is proposed. The model takes into account non-instantons kinetics of water crystallization, residual moisture content contained in the soil under temperature below the freezing temperature, moisture migration to the freezing front and an evolution of a stress strain state of the soil caused by thermal strain and volumetric expansion due to the phase change of water into ice and the moisture flow. Results of the performed study have been shown that the numerical prediction of temperature change are in good agreement to the measurements, but there is qualitative difference between the frost heave deformation given by the model and registered by the sensors. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Water-saturated soils, FBG-sensors, strain measurements in siols, numerical simulation Abstract Nowadays, in view of increasing occurrence depth and complication of hydrogeological conditions in mineral deposits, the construction of verti al shafts is condu ted using the artifi i l freezing techn l y. Therefore, mecha ic processes mechanical behavio of water- aturated rock layers du ing freezing and thawing processes quire deep analy is. The paper considers the possibility of using a fiber-optic system for recording a temperature decrease during a soil freezing process an deformations arising in w ter-saturated soil due to frost heave. The fe t r s of the freez front propagation and moisture redistributio are discu sed. Two types of experiment w re car ied out all-rou d eezing and one-side freezing. It is important that the experimen s simulate differ direction of freezing front propagatio . To analyze the experimental data a t ermo-hydro- chan cal model is proposed. The mod l takes into account non-instantons kin tics of water crystallization, residual moisture content c ntained in th soil under temperature below the freezing temperature, moisture migration to the freezing fro t and n volution of a stress strain state of the soil caused by therm l strain and volumetric expansion due to the phase change of water in o ice and the moisture fl w. Re ults of the performed study hav been shown that the numerical prediction of temperatur chang are in good agr ement to the measurements, but th re is qualit iv difference b tween the frost heav deformation given by th odel and r gistered by the sensors. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of European Structural Integrity Soci ty (ESIS) ExC Keywords: Water-saturated soils, FBG-sensors, strain measurements in siols, numerical simulation Abstract Nowadays, in view of increasing occurrence depth and complication of hydrogeological conditions in mineral deposits, the construction of vertical shafts is conducted using the artificial freezing technology. Therefore, mechanical processes mechanical behavior of water-saturated rock layers during freezing and thawing processes require a deep analysis.

* Corresponding author. Tel.: +7(342)-237-83-17 E-mail address: Prokhorov.a@icmm.ru * Corresponding author. Tel.: +7(342)-237-83-17 E-mail address: Prokhorov.a@icmm.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.130